source: 3DVCSoftware/trunk/source/Lib/TLibDecoder/NALread.cpp @ 976

Last change on this file since 976 was 976, checked in by tech, 10 years ago
  • Merged 11.1-dev0@975. (Clean ups)
  • Added coding results.
  • Changed version number.
File size: 6.1 KB
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1/* The copyright in this software is being made available under the BSD
2 * License, included below. This software may be subject to other third party
3 * and contributor rights, including patent rights, and no such rights are
4 * granted under this license.
5 *
6* Copyright (c) 2010-2014, ITU/ISO/IEC
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 *  * Redistributions of source code must retain the above copyright notice,
13 *    this list of conditions and the following disclaimer.
14 *  * Redistributions in binary form must reproduce the above copyright notice,
15 *    this list of conditions and the following disclaimer in the documentation
16 *    and/or other materials provided with the distribution.
17 *  * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
18 *    be used to endorse or promote products derived from this software without
19 *    specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
31 * THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34/**
35 \file     NALread.cpp
36 \brief    reading funtionality for NAL units
37 */
38
39
40#include <vector>
41#include <algorithm>
42#include <ostream>
43
44#include "NALread.h"
45#include "TLibCommon/NAL.h"
46#include "TLibCommon/TComBitStream.h"
47
48using namespace std;
49
50//! \ingroup TLibDecoder
51//! \{
52static void convertPayloadToRBSP(vector<uint8_t>& nalUnitBuf, TComInputBitstream *bitstream, Bool isVclNalUnit)
53{
54  UInt zeroCount = 0;
55  vector<uint8_t>::iterator it_read, it_write;
56
57  UInt pos = 0;
58  bitstream->clearEmulationPreventionByteLocation();
59  for (it_read = it_write = nalUnitBuf.begin(); it_read != nalUnitBuf.end(); it_read++, it_write++, pos++)
60  {
61    assert(zeroCount < 2 || *it_read >= 0x03);
62    if (zeroCount == 2 && *it_read == 0x03)
63    {
64      bitstream->pushEmulationPreventionByteLocation( pos );
65      pos++;
66      it_read++;
67      zeroCount = 0;
68      if (it_read == nalUnitBuf.end())
69      {
70        break;
71      }
72      assert(*it_read <= 0x03);
73    }
74    zeroCount = (*it_read == 0x00) ? zeroCount+1 : 0;
75    *it_write = *it_read;
76  }
77  assert(zeroCount == 0);
78 
79  if (isVclNalUnit)
80  {
81    // Remove cabac_zero_word from payload if present
82    Int n = 0;
83   
84    while (it_write[-1] == 0x00)
85    {
86      it_write--;
87      n++;
88    }
89   
90    if (n > 0)
91    {
92      printf("\nDetected %d instances of cabac_zero_word", n/2);     
93    }
94  }
95
96  nalUnitBuf.resize(it_write - nalUnitBuf.begin());
97}
98
99Void readNalUnitHeader(InputNALUnit& nalu)
100{
101  TComInputBitstream& bs = *nalu.m_Bitstream;
102
103  Bool forbidden_zero_bit = bs.read(1);           // forbidden_zero_bit
104  assert(forbidden_zero_bit == 0);
105  nalu.m_nalUnitType = (NalUnitType) bs.read(6);  // nal_unit_type
106#if H_MV
107  nalu.m_layerId = bs.read(6);                 // layerId
108#else
109  nalu.m_reservedZero6Bits = bs.read(6);       // nuh_reserved_zero_6bits
110  assert(nalu.m_reservedZero6Bits == 0);
111#endif
112  nalu.m_temporalId = bs.read(3) - 1;             // nuh_temporal_id_plus1
113
114  if ( nalu.m_temporalId )
115  {
116    assert( nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_BLA_W_LP
117         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_BLA_W_RADL
118         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_BLA_N_LP
119         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_IDR_W_RADL
120         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_IDR_N_LP
121         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_CRA
122         && nalu.m_nalUnitType != NAL_UNIT_VPS
123         && nalu.m_nalUnitType != NAL_UNIT_SPS
124         && nalu.m_nalUnitType != NAL_UNIT_EOS
125         && nalu.m_nalUnitType != NAL_UNIT_EOB );
126  }
127  else
128  {
129#if H_MV
130
131    // If nal_unit_type is in the range of BLA_W_LP to RSV_IRAP_VCL23, inclusive, i.e. the coded
132    // slice segment belongs to an IRAP picture, TemporalId shall be equal to 0.
133    // Otherwise, when nal_unit_type is equal to TSA_R, TSA_N, STSA_R, or STSA_N, TemporalId shall not be equal to 0.
134    // Otherwise, if nal_unit_type is equal to TSA or TSA_N, TemporalId shall not be equal to 0.
135    // Otherwise, when nuh_layer_id is equal to 0 and nal_unit_type is equal to STSA_R or STSA_N,
136    // TemporalId shall not be equal to 0.
137
138    assert( nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_TSA_R
139         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_TSA_N    );
140
141    assert( nalu.m_layerId > 0 
142      || ( nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_STSA_R
143        && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_STSA_N ) );
144#else
145    assert( nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_TSA_R
146         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_TSA_N
147         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_STSA_R
148         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_STSA_N );
149#endif
150  }
151}
152/**
153 * create a NALunit structure with given header values and storage for
154 * a bitstream
155 */
156void read(InputNALUnit& nalu, vector<uint8_t>& nalUnitBuf)
157{
158  /* perform anti-emulation prevention */
159  TComInputBitstream *pcBitstream = new TComInputBitstream(NULL);
160  convertPayloadToRBSP(nalUnitBuf, pcBitstream, (nalUnitBuf[0] & 64) == 0);
161 
162  nalu.m_Bitstream = new TComInputBitstream(&nalUnitBuf);
163  nalu.m_Bitstream->setEmulationPreventionByteLocation(pcBitstream->getEmulationPreventionByteLocation());
164  delete pcBitstream;
165  readNalUnitHeader(nalu);
166}
167//! \}
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